Re: filling area by color atack safety

Michael S <already5chosen@yahoo.com> writes:

On Sat, 30 Mar 2024 21:15:06 +0300
Michael S <already5chosen@yahoo.com> wrote:
>

On Fri, 29 Mar 2024 23:58:26 -0700
Tim Rentsch <tr.17687@z991.linuxsc.com> wrote:
>

One, the new code is a lot more complicated than the previous
code.  I'm not sure the performance gain is worth the cost
in complexity.  What kind of speed improvements do you see,
in terms of percent?

>
On my 11 y.o.  and not top-of-the-line even then home PC for 4K
image (3840 x 2160) with cross-in-cross shape that I took from one of
your previous post, it is 2.43 times faster.
I don't remember how it compares on more modern systems.  Anyway, right
now I have no test systems more modern than 3 y.o.  Zen3.

>
I tested on newer hardware - Intel Coffee Lake (Xeon-E 2176G) and AMD
Zen3 (EPYC 7543P).
Here I no longer see significant drop in speed of the 1x1 variant at 4K
size, but I still see that more complicated variant provides nice speed
up.  Up to 1.56x on Coffee Lake and up to 3x on Zen3.

On my test system the numbers are closer and also more evenly
balanced:  ratios range from about 0.70 to about 1.40, roughly
evenly split with the 2x2 version somewhat better.  There was
one outlier at approximately 1.48.  More precisely, the ratios
have an average of 1.06 (which means the 1x1 version is about
6 percent slower on average), with a standard deviation of 0.21.